研究生物基聚氨改性青混合物的动态和静态模块和爬行
Biao Han1, Yongming Xing2, Chao Li1
1College of Civil Engineering, Inner Mongolia University of Technology, Hohhot 010051, China.
Polymers
|February 13, 2025
概括
生物基聚氨青混合物使用木质素和基显示改进的机械性能. 这些可持续材料增强了青.
科学领域:
- 材料科学 材料科学 材料科学
- 土木工程 土木工程是指土木工程.
- 聚合物化学 聚合物化学
背景情况:
- 聚氨 (PU) 增强了青混合物,但依赖于石油衍生的聚合物.
- 减少石油消费与绿色经济趋势保持一致.
- 氨酸和氨酸为以石油为基础的聚合物提供了可持续的替代品.
研究的目的:
- 设计和评估一种生物基聚氨改性青混合物 (BPA-16).
- 为了比较BPA-16的粘弹性特性与传统的PU改性 (PA-16) 和矩阵青 (MA-16) 混合物.
- 评估使用红素和素作为固化剂的性能提升.
主要方法:
- 动态模量测试用于在不同频率和温度下评估粘弹性特性.
- 静态模量测试用于确定材料刚度.
- 单轴静态负载爬行测试,以评估对永久变形的抵抗力.
主要成果:
- 在-20°C和25Hz时,BPA-16的动态模量比MA-16高30.4%.
- 在50°C和25Hz时,BPA-16的相角比MA-16低26.3%,表明温度敏感性降低.
- BPA-16表现出最少的爬行应变,这意味着增强了对永久变形的抵抗力.
结论:
- 氨酸和氨酸有效地取代聚合物,提高了青在低温下的机械稳定性.
- 生物基PU修饰增强了在更广泛的温度范围内弹性特性.
- 可持续的PU改性青混合物提供卓越的性能和减少环境影响.
相关概念视频
01:16Dynamic Modulus of Elasticity of Concrete
250
The dynamic modulus of elasticity assesses how a concrete structure deforms under impact or dynamic loads. It is typically higher than the static modulus of elasticity, measured under slow, steady loading conditions.
The sonic test is a common method to determine the dynamic modulus. In this test, a concrete beam, sized either 6 x 6 x 30 inches or 4 x 4 x 20 inches, is clamped at its center. Vibrations are initiated at one end of the beam by an electromagnetic exciter unit powered by...
The sonic test is a common method to determine the dynamic modulus. In this test, a concrete beam, sized either 6 x 6 x 30 inches or 4 x 4 x 20 inches, is clamped at its center. Vibrations are initiated at one end of the beam by an electromagnetic exciter unit powered by...
250
01:22Creep in Concrete
140
Creep refers to the time-dependent increase in strain under a sustained load, excluding other time-dependent deformations associated with shrinkage, swelling, and thermal expansion in concrete. The primary mechanism behind creep involves the loss of physically adsorbed water from the calcium silicate hydrate within the hydrated cement paste. This process is further exacerbated by concrete's non-linear stress-strain relationship, microcrack development in the interfacial transition zone, and...
140
01:20Elasticity in Concrete
80
Upon subjecting concrete to moderate or high uniaxial compressive or tensile stresses, the strain response is non-linear relative to the stress applied. As the stress is removed, the resulting stress-strain curve deviates from the original path traced during loading, creating a hysteresis loop, indicative of the concrete's non-linear and non-elastic properties. Typically, a material's modulus of elasticity, which is a measure of the material's stiffness, is inferred from the linear...
80
01:28Factors Affecting Creep
110
In normal-weight aggregate concrete, the hardened cement paste is the primary contributor to creep, whereas the aggregates, being stiffer than the cement paste, are more resilient to stress-induced deformation. The stiffness of the aggregates is defined by their modulus of elasticity, and the more voluminous they are in the concrete, the less it will creep.
Further, the water/cement ratio is critical, as a lower ratio increases concrete strength, thus reducing creep. The strength of the...
Further, the water/cement ratio is critical, as a lower ratio increases concrete strength, thus reducing creep. The strength of the...
110
01:23Abrasion Resistance of Concrete
100
Abrasion resistance is an essential characteristic of concrete that determines its durability and longevity under various wear conditions. Concrete surfaces are vulnerable to different types of abrasion. For instance, surfaces may wear down due to the constant movement of vehicles or be eroded by solids carried in water, as seen in concrete canal linings. Specific tests are conducted to measure the abrasion resistance of concrete.
One such test is the revolving disc test, where three plates...
One such test is the revolving disc test, where three plates...
100
01:25Effects of Creep
89
Creep in concrete, the gradual deformation under prolonged stress, significantly impacts the integrity of structures. For reinforced concrete beams, it can be a vital design consideration, as it increases deflection, sometimes necessitating additional design measures. In columns, especially slender ones under eccentric loads, creep can cause buckling, compromising their stability. However, creep can be beneficial in indeterminate structures by mitigating stresses that arise from shrinkage,...
89